Trout do most of their eating near the bottom, on insects too small and too deep to see. Indicator nymphing puts your fly down there and gives you a clear signal when a fish eats it. An indicator is a small float - a bobber, basically - that rides the surface while one or two weighted nymphs hang below it.
Build the rig:
- Set your depth. Pin the indicator up your leader roughly 1.5 to 2 times the water depth above the fly. That extra length lets the nymph sink and tick just off the bottom.
- Get it down. Use a beadhead nymph, or crimp a split-shot onto the tippet about a foot above the fly. If you never touch bottom, add weight.
- Add a second fly. Tie a dropper nymph 18 to 24 inches off the first. Two flies double your odds and let you test two patterns at once.
Now fish it. Cast upstream, then mend the line above the indicator so the whole rig dead-drifts at current speed, with no dragging.
The take is subtle. Watch the indicator like a hawk. Any hesitation, dip, twitch, or sideways slide is a fish. Set the hook on all of them; you miss more by waiting than by guessing wrong.
Adjust depth until you start ticking bottom and catching, then leave it. It is less sensitive than euro nymphing but far easier to learn, and it covers the slower, deeper water euro rigs struggle in.